Accuracy Limit Factor of Current Transformer

What is accuracy limit factor(ALF) of CT? Let us first understand what is the accuracy limit factor of  current transformer. There are three types of current transformer widely used in a electrical network for protection  and metering purpose. The metering class CT is used for the measurement of electrical parameters. The protection class current transformer … Read more

Why can a 50Hz CT work on 60Hz systems, and why can’t a 60Hz C.T. work on a 50 Hz system?

CT or PT functions on the principle of electromagnetic induction. The electrical energy is first converted into magnetic energy and again the magnetic energy is converted in the electrical energy. The electrical current first converted in magnetic energy. The magnetic energy is nothing but converting electrical current into flux. The flux then flow through the … Read more

Current Transformer – Construction, Phasor and Errors

  Current transformer are widely used for measuring the high current. The Current transformer steps down high value of current to low value which measuring instrument can read. If 2000 Amperes current to be read by a meter, it is not possible to read because a amall shunt resistance of high power rating in parallel … Read more

Instrument Safety Factor of Current Transformer

  The current transformer is used for measuring the current.The specifications of the measuring class CT is as given below. The Instrument Safety Factor (ISF) is very important parameter for measuring class CT. CTR CT Terminal CT Burden Accuracy Class CT ISF 200/5      1S1-1S2 10 0.5 10 The secondary of the current transformer is connected to ampere … Read more

What is meaning of 5P20 in current transformer?

    There are three types of current transformers which are used for various application in; 1. Metering Purpose 2. Protection Purpose 3. Special Protection Purpose The particular class of CT is used for specific application. if one class of CT is used for other application the protection or measuring reliability is lost. If the metering … Read more